Through the latitude and longitude to obtain the angle between the two places, and determine the direction, which can be applied in economic geography. The function requires two parameters (latitude and longitude direction number), which is the latitude and longitude of a matrix of two columns, the first column is listed as the second latitude, longitude, direction number is 2 or 4, when the 2 Judgment of any two places in the direction of East-West or north-south direction, when 4 can to determine what, North and south, southeast northwest, southwest - Northeast direction. The output is the matrix, representing the direction of any two places.

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